Actually Minotaur, Jimmi can't turn on HTML here. This serice uses its own version of HTML called "UBB". Sure, they are abbreviated HTML codes, but they are limited and don't let users do some nasty things HTML might.
Jimmi, by clicking on the link below (UBB Code) you can see what commands you have available.
BTW, I have run a similar system (same software) for 2 years now, so I am very familiar with its workings. It's pretty slick, as BBS's go.